I've been using Stren Original in Lo-Vis Green 6 lb. mono for years. I always spool my lightweight rig with it, which gets most of the action. I have not been disappointed. As far as toughness goes, I landed this 45" NP last year with my lightweight rod using this line with a 1/4 oz jig at the end. At one point in the battle the line was through its mouth.

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for my heavier rod, I'm undecided, but usually go for something in the 10-12 lb range that has some "extra tough" type of label.